Xbox One will become more powerful without Kinect, confirms Microsoft

Xbox One developers will be getting access to more GPU bandwidth, which should bring better game performance in tow

From Techradar:

In June we're releasing a new SDK making it possible for developers to access additional GPU resources previously reserved for Kinect and system functions, a Microsoft spokesperson told TechRadar. The information was also tweeted by head of Xbox Phil Spencer, who promised more performances, new tools and flexibility to make games better. Further to that, Microsoft has confirmed to Eurogamer that up to 10% of additional GPU performance will be freed up, reiterating what was said by corporate VP for devices and studios Yusuf Mehdi.